https://www.codecademy.com/learn Learn html/css technology through this website. Since it is all in English, you can only understand part of it. Of course, you must borrow the powerful https://translate.google.com, this website The biggest advantage is that you can view the corresponding English through the hover of Chinese, which helps to master the grammar and format. It is highly recommended.
Of course, the two websites above need to be accessed scientifically. For scientific access, you can use ss-link.